Quote:
Originally Posted by FUNFER2
BryonRACE- looks like some deep thoughts with your pluming. Can you share with us your engine, charger, pluming ect. ? 
Have you had it on the dyno ? |
I had it on the dyno initially. It made 760/760 at 5500rpm at the rear wheels at 14lbs of boost with 19deg total advance and a 10:1 AFR. Dynojet 248. I shut it off when the air temps exceeded 200deg F because this engine runs on 91 octane pump fuel, and there was simply no point risking detonation with a few hundred miles on the engine when the power to the ground exceeded what I could use. Peak torque was right near 5500rpm so peak power would be around 7000 or so. Judging by the shape of the curve, 800rwhp was in the bank; which was the goal. Air temps were higher than expected, however, and I didn't like that...so I pullied it down to 80/40.
On the 80/40 pulley I never put it back on the dyno (yet) because the WSCB came around and I was more interested in driving the car. Since I have onboard instrumentation that tells me everything the dyno does, and more...I really havn't had the need. Right now peak torque is at 5400rpm. Peak power is at 7200rpm. Torque is 710ft-lbs at 5400rpm, power is 820hp at 7200. Peak boost is 12psi at 7200 with air temps at about 180deg F on a 70deg day.
Engine is a 7.88:1 compression 385 series BBF based on a production block, production forged 429 industrial crank, 4-bolt billet mains on 2,3,4, solid roller valvetrain, ported blue thunder heads, 5.0L Factory Ford Mustang fuel injection (modified, calibrated with Autologic myself). 83lb/hr injectors, weldon fuel system. I built all the EFI stuff (intake mods, intake hat, fuel rails, etc). I also built all the blower stuff (front drive, sprockets, tensioner, etc). Blower is a vortech V7-JT reverse rotation unit capable of 1600+cfm. No intercooler. Mass-Air based, blow-through. The mass air meter and bypass valve are in the fender. It all fits under hood. Fresh air comes through a viper naca duct frenched into the nose. Transmission is factory Dodge Viper 6spd (t56). Adapter was early or prototype, but is now available through multiple sources (Modern Driveline is who I work with).
There's no question in my mind that I could put the 80/30 cog back on it, throw some Torco Accelerator in the tank, put 26deg advance in it, and break 900hp at the tires (well over 1000fwhp). Right now it's tuned 10:1 AFR, 19deg total advance and has never seen anything other than 91 octane pump gas without a single ping...ever. Considering I still can't drive it as well as my old '93 Cobra that had half the power, I don't need more.
There's a pile of pictures on
www.racesystems.com/cobra if you want to see all the bits and pieces as I constructed this car since 2001 or so...
In an attempt to try to add something useful and on-topic to the thread, one of the reasons the turbo option was less attractive (I considered twins on the sidepipes and a single mounted much like my blower is now) was air temps. Turbo impellers spin a lot faster than centrifugal superchargers, and as such will require an intercooler at a much lower boost level unless you're running race fuels that can tolerate higher air temps. My car is strictly a pump gas machine; it burns enough fuel that at $10/gallon, it would take the joy out of driving it around on the street...so that wasn't an option. Once you mount an intercooler in the front of a cobra, the plumbing becomes that much more complicated in an already very crowded engine bay. It was too much challenge, imho. I still have the option of adding an intercooler to my existing setup if I so choose, but honestly don't see that happening...all it would do is add power when what I need to add is driver skill and familiarity. Additionally, if you've ever been to the NMRA drags or any other event where ford powered turbo combos are going down the track in front of you, the turbo kills the muscle car sound. A single turbo kills it almost completely (sounds like a vacuum cleaner, not a cobra, near zero exhaust note) and twins are only marginally louder. So, if you want the sonic experience, a turbo might ruin that for you. If you do run twin turbos, run straight pipes after them unless you intend to have the ultimate stealth-mode cobra. I think a set of T60's with muffled exhaust would end up sounding like nothing more than the worlds most powerful vacuum cleaner going down the track. Cool, yes...but it will be a way different sounding machine so expect it.
If you do go turbos and a cooler, consider an air/water unit built into the intake manifold. I have visions of something with twin 03 Cobra / Lightning cores built into the manifold (one would be enough to 700rwhp or so, but two is even better), a water pump, and a front mounted (smaller) air/water heat exchanger. That would be a real nice setup and would keep your air plumbing shorter and easier to route. Water plumbing is considerably smaller than air. Fabricating that intake would be a real project...but the end result sure would be cool.
Byron